1749168 - macOS version of Firefox using wrong refresh rate for render in some conditions

Status: NEW

(Core :: Widget: Cocoa, defect, P2)

Description

[rinsuki]

in Apple Silicon Mac (tested at M1 Max MBP2021):

• Primary Monitor's refresh rate are always used to rendering even window is rendered in other (different refresh-rate) monitor.
• e.g.
  • MBP 2021 has ProMotion (120Hz refresh rate) display, but If external 60Hz monitor is Primary Monitor, window wont be rendered in 120fps even window are rendered in ProMotion Display.
  • If ProMotion monitor is marked as primary monitor, window are rendered in 120fps even on 60Hz monitor.

in Intel Mac (with only Intel iGPU, I don't know about AMD GPU. tested at MBP2018, 13-inch):

• similar as Apple Silicon Mac, but...
• Primary Monitor's refresh rate at startup Firefox (!!) is always used to rendering instead of current Primary Monitor's refresh rate.
• even change primary monitor and/or refresh rate in system preferences after starts Firefox, it will not apply to Firefox rendering.

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'Core::Graphics' component, and is moving the bug to that component. Please revert this change in case you think the bot is wrong.